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冷　轧　带　肋　钢　筋

Cold rolled ribbed steel wires and bars

热轧圆盘条经冷轧后在其表面带有沿长度方向均匀分布的三面或二面横肋的钢筋。

The hot rolling round wire rod has after the cold rolling in its surface along the length direction uniform distribution three or two horizontal rib steel bars.

三面肋钢筋表面及截面形状 Three ribs steel bar surface and section shape

截面放大A—A

a一横肋斜角；β一横肋与钢筋轴线夹角；h一横肋中点高；l一横肋间距；

b一横肋顶宽；f_i一横肋间隙

二面肋钢筋表面及截面形状 Two ribs steel bar surface and section shape

截面放大A—A

a一横肋斜角；β一横肋与钢筋轴线夹角；h一横肋中点高度；l一横肋间距；

b一横肋顶宽；f_i一横肋间隙

冷轧带肋钢筋的牌号由字母CRB (C、R、B分别为冷轧-cold rolled、带肋-Ribbed、钢筋-Bar)和钢筋的抗拉强度最小值构成。

The cold rolling belt rib steel bar trademark by letter CRB (C, R, B respectively be cold rolling - cold rolled, belt rib - Ribbed, steel bar - Bar) and the steel bar tensile strength minimum value constitutes.

冷轧带肋钢筋分为 CRB550、CRB650、CRB800、CRB970、CRB1170 五个牌号。

The cold rolling belt rib steel bar divides into CRB550, CRB650, CRB800, CRB970, the CRB1170 five trademarks.

牌号	R_p0.2 MPa 不小于	R_m MPa 不小于	伸长率，％不小于		弯曲试验 180°	反复弯曲次数	应力松弛初始应力应相当于公称抗拉强度的70%
牌号	R_p0.2 MPa 不小于	R_m MPa 不小于	A_11.3	A₁₀₀	弯曲试验 180°	反复弯曲次数	1000h，％不大于
CRB550	500	550	8.0	－	D＝3d	－	－
CRB650	585	650	－	4.0	－	3	8
CRB800	720	800	－	4.0	－	3	8
CRB970	875	970	－	4.0	－	3	8
CRB1170	－	1170	－	4.0	－	3	8
注：表中D为弯心直径，d为钢筋公称直径

CRB550为普通钢筋混凝土用钢筋，其它牌号为预应力混凝土用钢筋。

CRB550 is the ordinary reinforced concrete uses the steel bar, other trademarks use the steel bar for the prestressed concrete.

CRB550钢筋的公称直径范围为4mm～12mm。CRB650及以上牌号钢筋的公称直径为4mm、5mm、6mm。

CRB550 steel bar nominal diameter scope is 4mm~12mm.CRB650 and above trademark steel bar nominal diameter is 4mm, 5mm, 6mm.

钢筋表面标志示例

Steel bar surface symbol demonstration

CRB550

CRB650

CRB800

CRB970

CRB1170

三面肋和二面肋钢筋的尺寸、重量及允许偏差

Three ribs and two ribs steel bar size, weight and allowable deviation

公称直径

公称横截面积

重量

横肋中点高

横肋1/4处高

h_1/4

横肋顶宽

横肋间隙

相对肋面积

f_r

不小于

理论重量

kg/m

允许偏差

％

允许偏差

％

4.5

5.5

6.5

7.5

12.6

15.9

19.6

23.7

28.3

33.2

38.5

44.2

50.3

56.7

63.6

70.8

78.5

86.5

95.0

103.8

113.1

0.099

0.125

0.154

0.186

0.222

0.261

0.302

0.347

0.395

0.445

0.499

0.556

0.617

0.679

0.746

0.815

0.888

±4

0.30

0.32

0.40

0.46

0.55

0.75

0.85

0.95

＋0.10

－0.05

0.24

0.26

0.32

0.37

0.44

0.60

0.68

0.76

~0.2d

4.0

5.0

6.0

7.0

7.4

8.4

±15

0.036

0.039

0.045

0.052

0.056

8.5

9.5

10.5

11.5

±0.10

注 1 横肋l/4处高、横肋顶宽供孔型设计用。Horizontal rib l/4 place high, the horizontal rib goes against the width to use for the roll pass design

2 二面肋钢筋允许有高度不大于0.5h的纵肋。Two rib steel bar permission has is not bigger than 0.5h highly the longitudinal rib

冷轧带肋钢筋用盘条的参考牌号和化学成份

The cold rolling belt rib steel bar uses the wire rod the reference trademark and the chemical composition

CRB550、CRB650、CRB800、CRB970钢筋用盘条的参考牌号及化学成分(熔炼分析)见表，60钢的Ni、Cr、Cu 含量各不大于0.25％。符合 GB／T 701、GB／T 4354或其他有关标准的规定。

CRB550, CRB650, CRB800, the CRB970 steel bar (smelting analysis) sees the table with the wire rod reference trademark and the chemical composition, 60 steel Ni, Cr, the Cu content is not bigger than 0.25% respectively. Conforms to GB/T 701, GB/T 4354 or other related standard stipulation.

钢筋牌号	盘条牌号	化学成分，％
钢筋牌号	盘条牌号	C	Si	Mn	V、Ti	S	P
CRB550 CRB650	Q215	0.09~0.15	≤0.30	0.25~0.55	－	≤0.050	≤0.045
CRB550 CRB650	Q235	0.14~0.22	≤0.30	0.30~0.65	－	≤0.050	≤0.045
CRB800	24MnTi	0.19~0.27	0.17~0.37	1.20~1.60	Ti:0.01~0.05	≤0.045	≤0.045
CRB800	20MnSi	0.17~0.25	0.40~0.80	1.20~1.60	－	≤0.045	≤0.045
CRB970	41MnSiV	0.37~0.45	0.60~1.10	1.00~1.40	V:0.05~0.12	≤0.045	≤0.045
CRB970	60	0.57~0.65	0.17~0.37	0.50~0.80	－	≤0.035	≤0.035
CRE1170	70Ti	0.66~0.70	0..17~0.37	0.60~1.00	Ti:0.01~0.05	≤0.045	≤0.045
CRE1170	70	0.67~0.75	0.17~0.37	0.50~0.80	－	≤0.035	≤0.035